To set up the DJI Lidar Autofocus system, you need to enter the installation distance between the Lidar front and the plane sensor depth of the Blackmagic Pocket 6K with EF Mount. The depth from the front of the lens mount to the chip is 44mm. Now, you just have to measure and add the result from the lens mount to the front of the Lidar system. That’s the installation depth.
Here is a link to the manual:
(In my case with my tamron 24-70mm and my special mounting construction it is 134mm.